Treatment of oily wastewater from cold-rolling mill through coagulation and integrated membrane processes

다국어 초록 (Multilingual Abstract)

The feasibility of applying coagulation-integrated microfiltration (MF) as a pretreatment for an ultrafiltration (UF) feed in oily wastewater treatment was investigated. The effects of different coagulants on oil removal rates from wastewater were studied. The maximum oil removal rate of 82% was obtained after coagulation with 130 mg/L of polyaluminium chloride (PAC). UF flux reached 95 L/(㎡·h) with coagulation-integrated MF as pretreatment. This value was 2.5 times higher than that flux obtained without pretreatment. The value of UF flux increased as the transmembrane pressure (TMP) and cross-flow velocity (CFV) of the UF module increased. UF flux gradually increased when TMP and CFV exceeded 0.4 MPa and 3 m/s, respectively, because of concentration polarization and membrane fouling stabilization. Chemical oxygen demand reduction and oil removal rate reached 95.2% and 98.5%, respectively, during integrated membrane processing with a PAC concentration of 130 mg/L, TMP of 0.4 MPa, and CFV of 3 m/s for UF. In addition, sequentially cleaning the fouling membrane with NaOH and HNO₃ aqueous solutions caused UF flux to recover to 90%. These encouraging results suggested that the hybrid integrated membrane process-based coagulation and MF + UF are effective approaches for oily wastewater treatment.

목차 (Table of Contents)

• ABSTRACT
• 1. Introduction
• 2. Methods
• 3. Results and Discussion
• 4. Conclusions
• References

참고문헌 (Reference)

1 Mohammadi T, "Wastewater treatment of avegetable oil factory by a hybrid ultrafiltration-activated carbon process" 254 : 129-137, 2005

2 Lobo A, "Ultrafiltration of oil-in-water emulsions with ceramic membranes: Influence of pH and crossflow velocity" 278 : 328-334, 2006

3 Zhang YH, "Treatment of reused comprehensive wastewater in iron and steel industry with electrosorption technology" 18 : 37-42, 2011

4 Yahiaoui O, "Treatment of olive mill wastewater by the combination of ultrafiltration and bipolar electro-chemical reactor processes" 50 : 37-41, 2011

5 Matos M, "Treatment of oil-in-water emulsions by a destabilization/ultrafiltration hybrid process: Statistical analysis of operating parameters" 59 : 295-302, 2016

6 Gutierrez G, "Treatment of a waste oil-in- water emulsion from a copper-rolling process by ultrafiltration and vacuum evapora-tion" 185 : 1569-1574, 2011

7 Zhu Y, "Recent progress in developing advanced membranes for emulsified oil/water separation" 6 : e101-, 2014

8 Jamaly S, "Recent improvements in oil wastewater treatment: Progress, challenges, and future opportunities" 37 : 15-30, 2015

9 Hua FL, "Performance study of ceramic microfiltration membrane for oily wastewater treatment" 128 : 169-175, 2007

10 Karhu M, "Performance of a commercial industrial-scale UF-based process for treatment of oily wastewaters" 128 : 413-420, 2013

11 Pulido JMO, "On the optimization of a flocculation process as fouling inhibiting pretreatment on an ultrafiltration membrane during olive mill effluents treatment" 393 : 151-158, 2016

12 Luo L, "Oil/water separation via ultrafiltration by novel triangle-shapetri-bore hollow fiber membranes from sulfonated polyphenylenesulfone" 476 : 162-170, 2015

13 Rajasekhar T, "Oil-water emulsion separation using ultrafiltration membranes based on novel blends of poly (vinylidene fluoride) and amphiphilic tri-block copolymer containing carboxylic acid functional group" 481 : 82-93, 2015

14 Zhang YH, "New integrated processes for treating cold-rolling mill emulsion wastewater" 17 : 32-35, 2010

15 Duong PH, "Highly permeable double-skinned forward osmosis membranes for anti-fouling in the emulsified oil-water separation process" 48 : 4537-4545, 2014

16 Ohya H, "Effects of pore size on separation mechanisms of microfiltration of oily water using porous glass tubular membrane" 145 : 1-14, 1998

17 Yuliwati E, "Effect of additives concentration on the surface properties and performance of PVDF ultrafiltration membranes for refinery produced wastewater treatment" 273 : 226-234, 2011

18 Chakrabarty B, "Cross-flow ultrafiltration of stable oil in water emulsion using polysulfone membranes" 165 : 447-456, 2010